Attach the Ceiling Fan base between the rafters with 4 bolts (two per side). The paddle fan is usually placed in the center of the Pergola's ceiling, but of course, you can place it almost anywhere you have sufficient head space.
Many customers have told us that by far the best manufacturer is a company out of Kentucky called the Big Ass Fan Company. Funny name, greats fans. They move a lot of air, are quiet and are probably the best in the business.